Tool-Flo 1270993 Helical Flute Thread Mills; Material: Carbide ; Thread Size (Inch): 5/16-24 ; Thread Type: Internal ; Shank Diameter (Decimal Inch): 0.2500 ; Cutting Diameter (Decimal Inch): 0.2000 ; Length Of Cut (Decimal Inch - 4 Decimals): 0.6000